The 4.7 V8 has timing chains, not belts and when I had mine apart at 245,000 to change the head gaskets the timing chains were still within spec and showed no signs of wear. I did replace the timing chain guides though as they were a bit worn.
Dunno what the OEM water pumps are good for (km wise), however I also replaced the WP at 245,000 with a generic one from the USA and it only lasted 40,000km.
Change the oil and filter every 10,000 with good quality oil and keep on top of other regular service items and it will last for ages. They are a pretty bulletproof engine provided you don't overheat them, when they can drop valves, so be frugal with the cooling system.
Good luck!
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